擠實碎石（砂）樁施工工藝.doc
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A． 施工方法
a. 恢復中線，放出路段邊線樁，清理平整施工段地基表面。做好排水系統(tǒng)，保證排水通道的暢通。
工工藝.rar擠實碎石（砂）樁b. 測繪擠實碎石樁平面圖，準確放出樁位并編號。
c. 將沉管機就位，套管對準樁孔，提起芯管從外圍或路基二側(cè)向路中間順序進行沉管。
d. 按設計填料量填筑碎石，錘擊下沉至設計深度。
e. 提起芯管，填注碎石英鐘，錘擊套管芯管，將碎石擠出套管，提起套管芯管。
f. 兩次填筑碎石，錘擊芯管，使碎石擠實，直至形成碎石樁柱。
g. 擠實碎石樁的質(zhì)量以填料量和密實電流控制。直徑為0.5m的碎石樁的碎石置換量約0.224m3，錘擊擠密的密實電流控制在40——50A。施工時應作好記錄，使樁身密實度達到設計要求。
h. 施工路段打樁結(jié)束后，平整樁頂及周圍地面，除去浮土壓實，再鋪筑25cm碎石墊層壓實。
B． 工藝流程框圖
Compaction gravel (sand) pile
A. Construction Method
a. recovery center line, release sideline section pile, the construction of Ground flat surface cleaning. Good drainage system to ensure the smooth flow of drainage channels.
b. Gravel Compaction Pile plan mapping, accurate release Pile and number.
c. the immersed tube machine in place, casing aligned pile hole, core pipe brought from outside or middle of the road embankment side order of two immersed tube.
d. Design of packing capacity by filling gravel, sank to the design depth of the hammer.
e. bring core pipe, filling broken quartz clock, hammering the core casing pipe, casing out of the rubble, raised core pipe casing.
f. two filling of rubble, hammer the core tube, so Gravel fact, until the formation of gravel piles.
g. Compaction quality of stone columns to fill current control volume and density. 0.5m diameter pile of gravel replacement of gravel about 0.224m3, hammer compaction of the dense current control in the 40 - 50A. Construction should be well recorded, so pile density to meet the design requirements.
h. After the construction of roads piling, pile top and the surrounding ground level, remove the surface dust compaction, and then paving 25cm compacted hardcore.
B. Process Diagram